Debian - linux console hides the last lines at the end. Can't see the cursor line.

Hello, i have installed Debian Sqeeze on my desktop and have a problem. When i exit the X and go back to console i can't see the last (5-10) lines including of caurse the line of the cursor. Whatever i do i can see only some lines above. Can you help me?
I include my /boot/grub/grub.cfg file.

Code:

# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###